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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
Diastole /daÉªËaestÉliË/ daÉªËÃ¦stÉliË is the part of the cardiac cycle when the heart refills with blood following (systole). Contraction ventricular diastole is the period during which the ventricles are filling and, relaxing while atrial diastole is the period during which the atria are. relaxingiastole /daÉªËaestÉliË/ daÉªËÃ¦stÉliË is the part of the cardiac cycle when the heart refills with blood following (systole). Contraction ventricular diastole is the period during which the ventricles are filling and, relaxing while atrial diastole is the period during which the atria are. relaxing